The GE Lighting G20T10 is a 20W Germicidal (AKA 254nm or UVC ) Lamp with 7.5 Watts UV. Typical lifetime is 8000 hours. This lamp has two G13 (medium bi-pin) bases on the 32.5mm diameter x 588.5mm long (excluding pins) clear T10 tube. This item is GE Lighting brand, and is also commonly available from Sankyo-Denki, Osram-Sylvania, Ushio, UVP, American Ultraviolet, among many others, as part numbers 3000314, 34-0067-01, 34006701, S47608-2A, and many more. Product Warning: Germicidal lamps emit harmful ULTRAVIOLET RADIATION (UVC). Avoid direct or reflected exposure as this can cause serious skin burns and eye injury. This lamp SHOULD NOT BE USED FOR ILLUMINATION PURPOSES. Skin and eye protection should be worn at all times when operating.